Max L, Caruso A J
Kent State University, Ohio, USA.
J Speech Lang Hear Res. 1998 Dec;41(6):1265-81. doi: 10.1044/jslhr.4106.1265.
This study is part of a series investigating the hypothesis that stuttering adaptation is a result of motor learning. Previous investigations indicate that nonspeech motor learning typically is associated with an increase in speed of performance. Previous investigations of stuttering, on the other hand, indicate that improvements in fluency during most fluency-enhancing conditions or after stuttering treatment tend to be associated with decreased speech rate, increased duration of specific acoustic segments, and decreased vowel duration variability. The present acoustic findings, obtained from 8 individuals who stutter, reveal that speech adjustments occurring during adaptation differ from those reported for other fluency-enhancing conditions or stuttering treatment. Instead, the observed changes are consistent with those occurring during skill improvements for nonspeech motor tasks and, thus, with a motor learning hypothesis of stuttering adaptation. During the last of 6 repeated readings, a statistically significant increase in articulation rate was observed, together with a decrease in word duration, vowel duration, and consonant-vowel (CV) transition extent. Other adjustments showing relatively consistent trends across individual subjects included decreased CV transition rate and duration, and increased variability of both CV transition extent and vowel duration.
本研究是一系列调查口吃适应是运动学习结果这一假设的一部分。先前的调查表明，非言语运动学习通常与表现速度的提高有关。另一方面，先前对口吃的调查表明，在大多数流畅性增强条件下或口吃治疗后，流畅性的提高往往与语速降低、特定声学片段时长增加以及元音时长变异性降低有关。从8名口吃者身上获得的当前声学研究结果表明，适应过程中发生的言语调整与其他流畅性增强条件或口吃治疗中报告的情况不同。相反，观察到的变化与非言语运动任务技能提高过程中发生的变化一致，因此，与口吃适应的运动学习假设一致。在6次重复阅读的最后一次中，观察到发音速率有统计学意义的增加，同时单词时长、元音时长和辅音-元音（CV）过渡程度降低。在个体受试者中显示出相对一致趋势的其他调整包括CV过渡速率和时长降低，以及CV过渡程度和元音时长的变异性增加。
